Threat Database Trojans Trojan.MSIL.Agent.R

Trojan.MSIL.Agent.R

By CagedTech in Trojans

Threat Scorecard

Threat Level: 80 % (High)
Infected Computers: 84
First Seen: July 30, 2021
Last Seen: December 1, 2025
OS(es) Affected: Windows

The detection of Trojan.MSIL.Agent.R on a system indicates the presence of a malicious program that could potentially cause harm. This report aims to provide general guidance on understanding and removing this threat. It's essential to approach malware removal with caution and follow best practices to minimize risks.

What Is Trojan.MSIL.Agent.R?

Trojan.MSIL.Agent.R is identified as a Trojan-type threat, which is a broad category of malware that can perform a variety of malicious functions. Trojans are often designed to appear as legitimate software but actually allow unauthorized access to a computer, steal data, or disrupt system operations. The specifics of what Trojan.MSIL.Agent.R does can vary, but its classification as a Trojan indicates it is not welcome on any system.

How Trojan.MSIL.Agent.R Operates

Like many Trojans, Trojan.MSIL.Agent.R likely operates by exploiting vulnerabilities in software or tricking users into installing it. Once installed, it may communicate with its creators or other malicious servers to receive instructions or send stolen data. The exact mechanisms can depend on the malware's design and intent, which could range from data theft to using the infected computer as part of a botnet for more extensive malicious activities.

Symptoms of Infection

Symptoms of a Trojan.MSIL.Agent.R infection can be subtle or overt, depending on its primary function and the system it infects. Common signs include unusual system behavior, such as unexpected crashes, slow performance, or the appearance of unwanted programs or toolbars. Some infections may also lead to changes in browser settings or the presence of pop-up ads. However, some Trojans are designed to operate stealthily, making them harder to detect without specific security software.

How to Remove Trojan.MSIL.Agent.R

  1. Boot your computer in Safe Mode with Networking. This will limit the malware's ability to interfere with the removal process while still allowing you to download and install necessary tools.
  2. Perform a full scan of your system using a reputable anti-malware tool, such as SpyHunter. Ensure the tool is updated with the latest definitions to improve the chances of detecting and removing the threat.
  3. Uninstall any suspicious programs that you do not recognize or that were installed around the time the infection was detected. Be cautious and only remove programs you are certain are malicious or unnecessary.
  4. Reset your web browsers (Chrome, Firefox, Edge, etc.) to their default settings. This can help remove any malicious extensions or settings changes made by the Trojan.
  5. Reboot your computer and perform another full scan with your anti-malware tool to ensure that the threat has been fully removed. This step is crucial as some malware can reinstall itself if not completely eradicated.

Conclusion

Removing Trojan.MSIL.Agent.R requires careful steps to ensure the malware is fully eradicated from the system. It's also a good opportunity to review your computer's security posture, including ensuring all software is up to date, using strong, unique passwords, and being cautious with email attachments and links from unknown sources. Preventing malware infections is often more manageable than removing them, so maintaining good digital hygiene is key to protecting your data and system integrity.

Analysis Report

General information

Family Name: Trojan.MSIL.Agent.R
Signature status: No Signature

Known Samples

MD5: a1dd0eb9523e98e809cd7feae2998b63
SHA1: 691ebf891ef1735e2b4f0696c96bd49a0d85b435
SHA256: DA50934FC85F9E4F1B4E5DD5F0AC829F4A21455356385B0EFF957739599B42CC
File Size: 6.66 KB, 6656 bytes

Windows Portable Executable Attributes

  • File doesn't have "Rich" header
  • File doesn't have debug information
  • File doesn't have exports table
  • File doesn't have security information
  • File is .NET application
  • File is 32-bit executable
  • File is either console or GUI application
  • File is GUI application (IMAGE_SUBSYSTEM_WINDOWS_GUI)
  • File is not packed
  • IMAGE_FILE_DLL is not set inside PE header (Executable)
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  • IMAGE_FILE_EXECUTABLE_IMAGE is set inside PE header (Executable Image)

Windows PE Version Information

Name Value
Assembly Version 0.0.0.0
File Version 0.0.0.0
Internal Name server.exe
Original Filename server.exe
Product Version 0.0.0.0

File Traits

  • .NET
  • x86

Block Information

Total Blocks: 7
Potentially Malicious Blocks: 5
Whitelisted Blocks: 2
Unknown Blocks: 0

Visual Map

0 0 x x x x x
0 - Probable Safe Block
? - Unknown Block
x - Potentially Malicious Block

Similar Families

  • MSIL.Agent.R
  • MSIL.Agent.RA

Windows API Usage

Category API
Syscall Use
  • ntdll.dll!NtAlpcSendWaitReceivePort
  • ntdll.dll!NtClearEvent
  • ntdll.dll!NtClose
  • ntdll.dll!NtCreateEvent
  • ntdll.dll!NtCreateFile
  • ntdll.dll!NtCreateMutant
  • ntdll.dll!NtCreatePrivateNamespace
  • ntdll.dll!NtCreateSection
  • ntdll.dll!NtCreateThreadEx
  • ntdll.dll!NtDuplicateObject
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  • ntdll.dll!NtEnumerateKey
  • ntdll.dll!NtEnumerateValueKey
  • ntdll.dll!NtFreeVirtualMemory
  • ntdll.dll!NtMapViewOfSection
  • ntdll.dll!NtOpenDirectoryObject
  • ntdll.dll!NtOpenEvent
  • ntdll.dll!NtOpenFile
  • ntdll.dll!NtOpenKey
  • ntdll.dll!NtOpenKeyEx
  • ntdll.dll!NtOpenProcess
  • ntdll.dll!NtOpenProcessToken
  • ntdll.dll!NtOpenSection
  • ntdll.dll!NtOpenThreadToken
  • ntdll.dll!NtProtectVirtualMemory
  • ntdll.dll!NtQueryAttributesFile
  • ntdll.dll!NtQueryDefaultLocale
  • ntdll.dll!NtQueryDirectoryFileEx
  • ntdll.dll!NtQueryFullAttributesFile
  • ntdll.dll!NtQueryInformationFile
  • ntdll.dll!NtQueryInformationJobObject
  • ntdll.dll!NtQueryInformationProcess
  • ntdll.dll!NtQueryInformationThread
  • ntdll.dll!NtQueryInformationToken
  • ntdll.dll!NtQueryKey
  • ntdll.dll!NtQueryLicenseValue
  • ntdll.dll!NtQueryPerformanceCounter
  • ntdll.dll!NtQuerySecurityAttributesToken
  • ntdll.dll!NtQuerySecurityObject
  • ntdll.dll!NtQuerySystemInformation
  • ntdll.dll!NtQuerySystemInformationEx
  • ntdll.dll!NtQueryValueKey
  • ntdll.dll!NtQueryVirtualMemory
  • ntdll.dll!NtQueryVolumeInformationFile
  • ntdll.dll!NtReadFile
  • ntdll.dll!NtReleaseMutant
  • ntdll.dll!NtReleaseWorkerFactoryWorker
  • ntdll.dll!NtResumeThread
  • ntdll.dll!NtSetEvent
  • ntdll.dll!NtSetInformationKey
  • ntdll.dll!NtSetInformationProcess
  • ntdll.dll!NtTestAlert
  • ntdll.dll!NtTraceControl
  • ntdll.dll!NtUnmapViewOfSection
  • ntdll.dll!NtUnmapViewOfSectionEx
  • ntdll.dll!NtWaitForSingleObject
  • ntdll.dll!NtWaitForWorkViaWorkerFactory
  • ntdll.dll!NtWaitLowEventPair
  • ntdll.dll!NtWriteFile
  • UNKNOWN
User Data Access
  • GetComputerNameEx
  • GetUserObjectInformation

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